94 lines
1.7 KiB
V
94 lines
1.7 KiB
V
import sync
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import time
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fn do_rec_i64(mut ch sync.Channel) {
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mut sum := i64(0)
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for i in 0 .. 300 {
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if i == 200 {
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ch.close()
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}
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mut a := i64(0)
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if ch.pop(&a) {
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sum += a
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}
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}
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assert sum == 200 * (200 - 1) / 2
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}
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fn do_send_int(mut ch sync.Channel) {
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for i in 0 .. 300 {
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ch.push(&i)
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}
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ch.close()
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}
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fn do_send_byte(mut ch sync.Channel) {
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for i in 0 .. 300 {
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ii := byte(i)
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ch.push(&ii)
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}
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ch.close()
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}
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fn do_send_i64(mut ch sync.Channel) {
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for i in 0 .. 300 {
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ii := i64(i)
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ch.push(&ii)
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}
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ch.close()
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}
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fn test_select() {
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mut chi := sync.new_channel<int>(0)
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mut chl := sync.new_channel<i64>(1)
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mut chb := sync.new_channel<byte>(10)
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mut recch := sync.new_channel<i64>(0)
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go do_rec_i64(mut recch)
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go do_send_int(mut chi)
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go do_send_byte(mut chb)
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go do_send_i64(mut chl)
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mut channels := [chi, recch, chl, chb]
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directions := [sync.Direction.pop, .push, .pop, .pop]
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mut sum := i64(0)
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mut rl := i64(0)
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mut ri := int(0)
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mut rb := byte(0)
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mut sl := i64(0)
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mut objs := [voidptr(&ri), &sl, &rl, &rb]
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for j in 0 .. 1101 {
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idx := sync.channel_select(mut channels, directions, mut objs, time.infinite)
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match idx {
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0 {
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sum += ri
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}
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1 {
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sl++
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}
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2 {
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sum += rl
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}
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3 {
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sum += rb
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}
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-2 {
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// channel was closed - last item
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assert j == 1100
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}
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else {
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println('got $idx (timeout)')
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assert false
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}
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}
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if j == 1100 {
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// check also in other direction
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assert idx == -2
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}
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}
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// Use Gauß' formula for the first 2 contributions
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expected_sum := 2 * (300 * (300 - 1) / 2) +
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// the 3rd contribution is `byte` and must be seen modulo 256
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256 * (256 - 1) / 2 +
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44 * (44 - 1) / 2
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assert sum == expected_sum
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}
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